Surprisingly, I could not find a log on my Snow Leopard system that showed what cron was doing. I know that Apple is big on launchd (which is on my list of things to learn about someday), but I’m a Unix guy and I needed to debug a little cron job that I wrote for backing up files.
Well, I found out how to enable cron logging; here’s the answer on superuser.com. You have to edit a plist file and use
launchctl to unload and load said plist file.